We were never explicitly told to bring my spouse with me for my interview, but she came along anyway as we knew there was a high probability of a combo interview. Now, my wife was never called in on the day and my I-751 and N-400 were approved on the day, but the interviewer did mention that it was a good thing that my spouse was with me all the same, just in case any issue arose.
She should 100% go with you to avoid any delays int he future.